EP 1341599 A4 20060719 - CATALYST FOR PURIFYING EXHAUST GASES
Title (en)
CATALYST FOR PURIFYING EXHAUST GASES
Title (de)
KATALYSATOR ZUR REINIGUNG VON ABGASEN
Title (fr)
CATALYSEUR DESTINE A EPURER DES GAZ D'ECHAPPEMENT
Publication
Application
Priority
- US 0142752 W 20011015
- US 24648300 P 20001106
Abstract (en)
[origin: WO0236254A1] A catalyst for purification of exhaust gases including (1) a catalysis-promoting coating comprising a noble metal catalyst and a NOx storage component loaded onto a carrier material, wherein the NOx storage component comprises an alkali metal and, (2) a ceramic substrate for supporting the catalysis-promoting coating, wherein the ceramic substrate exhibits resistance to alkali metal migration below 1000 DEG C and a coefficient of thermal expansion of less than about 25x10<-7>/ DEG C (25-800 DEG C). A second aspect of the invention is a process for purifying an exhaust gas from a lean burn engine involving simultaneously removing carbon monoxide, hydrocarbons and nitrogen oxides by bringing the exhaust gas from a lean burn engine into contact with the exhaust gas purifying catalyst of the present invention disclosed above. In this process a majority of the nitrogen oxides in the exhaust gas are adsorbed to the NOx storage component on the porous support under a lean burn atmosphere in which oxidizing concentrations are above a stoichiometric point that is required for oxidizing components to be oxidized in the exhaust gas. Furthermore, when the exhaust gas is temporarily change from lean burn to fuel-rich, the adsorbed nitrogen oxides are released and chemically reduced by a reaction with the hydrocarbons and carbon monoxide in the exhaust gas under a stoichiometric atmosphere or a fuel-rich atmosphere in which oxygen concentrations are below stoichiometric point.
IPC 1-7
IPC 8 full level
B01D 53/86 (2006.01); B01D 53/94 (2006.01); B01J 23/58 (2006.01); B01J 23/63 (2006.01); B01J 35/00 (2006.01); C04B 35/44 (2006.01); C04B 35/46 (2006.01); C04B 41/85 (2006.01); F01N 3/08 (2006.01); F01N 3/10 (2006.01); F01N 3/28 (2006.01); B01J 37/02 (2006.01)
CPC (source: EP KR US)
B01D 53/865 (2013.01 - EP US); B01D 53/9422 (2013.01 - EP US); B01J 23/38 (2013.01 - KR); B01J 23/58 (2013.01 - EP US); B01J 23/63 (2013.01 - EP US); C04B 35/117 (2013.01 - EP US); C04B 35/44 (2013.01 - EP US); C04B 35/462 (2013.01 - EP US); C04B 35/465 (2013.01 - EP US); C04B 38/0006 (2013.01 - EP US); F01N 3/0814 (2013.01 - EP US); F01N 3/0842 (2013.01 - EP US); B01D 2255/102 (2013.01 - EP US); B01D 2255/2022 (2013.01 - EP US); B01D 2255/2042 (2013.01 - EP US); B01D 2255/2045 (2013.01 - EP US); B01D 2255/2047 (2013.01 - EP US); B01D 2255/206 (2013.01 - EP US); B01D 2255/91 (2013.01 - EP US); B01J 37/0215 (2013.01 - EP US); C04B 2111/00793 (2013.01 - EP US); C04B 2111/0081 (2013.01 - EP US); C04B 2235/3206 (2013.01 - EP US); C04B 2235/3208 (2013.01 - EP US); C04B 2235/3217 (2013.01 - EP US); C04B 2235/3222 (2013.01 - EP US); C04B 2235/3234 (2013.01 - EP US); C04B 2235/3236 (2013.01 - EP US); C04B 2235/3244 (2013.01 - EP US); C04B 2235/3272 (2013.01 - EP US); C04B 2235/80 (2013.01 - EP US); F01N 2510/06 (2013.01 - EP US)
Citation (search report)
- [A] PATENT ABSTRACTS OF JAPAN vol. 3, no. 100 24 August 1979 (1979-08-24)
- See references of WO 0236254A1
Designated contracting state (EPC)
BE DE FR GB IT
DOCDB simple family (publication)
WO 0236254 A1 20020510; CN 1479648 A 20040303; DE 60139569 D1 20090924; EP 1341599 A1 20030910; EP 1341599 A4 20060719; EP 1341599 B1 20090812; JP 2004515338 A 20040527; KR 20030061393 A 20030718; US 2002081255 A1 20020627; US 6897182 B2 20050524
DOCDB simple family (application)
US 0142752 W 20011015; CN 01820272 A 20011015; DE 60139569 T 20011015; EP 01981887 A 20011015; JP 2002539055 A 20011015; KR 20037006224 A 20030506; US 234301 A 20011025